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The Amtrak Susquehanna River Bridge is a Howe deck truss structure that carries two tracks of Amtrak's Northeast Corridor line across the Susquehanna River between Havre de Grace and Perryville, Maryland.〔 == History == The vicinity of the bridge has been used as a river crossing for more than 300 years. In 1695, the colonial General Assembly granted the first licenses to operate a ferry between Perryville and what is now Havre de Grace. In 1837, railroad lines south from Wilmington, Delaware, and north from Baltimore arrived at the riverbanks. For 29 years, including the duration of the American Civil War, a train ferry carried passengers (on foot) and freight cars between the two towns. In 1854, a larger ferryboat began to transport entire passenger cars across the river.〔 In 1866, after 12 years of intermittent construction, the Philadelphia, Wilmington, and Baltimore Railroad (PW&B) completed a wooden single-track railroad bridge. Iron reinforcements were added between 1874 and 1880. In 1881, when the Pennsylvania Railroad (PRR) formally took control of the PW&B, it cut rival Baltimore & Ohio Railroad's access to the PW&B. The B&O was forced to construct a parallel route between Baltimore and Philadelphia, including a new bridge about upstream. In 1904-06, the PRR replaced the PW&B crossing with a new bridge just a few yards upstream.〔 Opened on May 29, 1906,〔 it includes a center swing span to increase vertical clearance for water traffic from the nominal .〔 In 1934, the PRR began installing catenary on the span to help extend 11,000-volt electrification south from Wilmington to Washington, D.C. Regular electrified passenger service across the bridge began on February 10, 1935.〔 Ownership of the bridge passed to Amtrak in 1976 when it acquired much of the Northeast Corridor infrastructure. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Amtrak Susquehanna River Bridge」の詳細全文を読む スポンサード リンク
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